The invention relates to an integrated boring and drilling machine provided with an efficient cornish bit. The integrated boring and drilling machine comprises a lathe tail base, a lathe body, a middle mold base, a lathe head base and a main hydraulic rod, wherein the lathe tail base is fixedly arranged on one end of the lathe body; the lathe head base is fixedly arranged on the other end of the lathe body; the middle mold base is adjustably arranged the lathe body between a lathe head tank and a lathe tail tank; the lathe tail seat, the middle mold base and the lathe head base are provided with coaxial center holes used for coaxially supporting a to-be-processed workpiece; the main hydraulic rod is fixedly arranged on the lathe body outside one end of the lathe head base and passes through a central hole of the lathe head base, and one side of the workpiece is coaxially provided with the cornish bit; the middle edges of waste ports at the working end surface of the cornish bit are symmetrically and fixedly provided with cutters, and the waste port outside the cutter on one side is fixedly provided with an auxiliary cutter. The integrated boring and drilling machine is simple in structure and reasonable in design, and can be used for effectively ensuring the processing efficiency of equipment, further ensuring the axiality and processing precision of processed workpieces, saving materials and manpower obviously improving the production efficiency and quality and effectively increasing the reaming quantity of each time.